Parking lot & site lighting maint can account for 1/3 of our business. Service/maint calls at the comm accts is another 1/3 and comm reno is the balance basically. (Resi is very minimal)
I keep 4 guys busy. Yes, we have the "slow" times like we all do, but a "great" customer base helps.
Basically, I had the same decission that you face about 19 years ago. Hey, if it don't work out, you can always go back to the day job, right??